| 深反射地震数据揭示的拉萨地体北部到羌塘地体南部地壳厚度的变化 |
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| 引用本文： | 卢占武,高锐,李洪强,李文辉,熊小松,徐泰然.深反射地震数据揭示的拉萨地体北部到羌塘地体南部地壳厚度的变化[J].中国地质,2016(5):1679-1687. |
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| 作者姓名： | 卢占武 高锐 李洪强 李文辉 熊小松 徐泰然 |
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| 作者单位： | 中国地质科学院地质研究所, 北京 100037;国土资源部深部探测与地球动力学重点实验室, 北京 100037,中国地质科学院地质研究所, 北京 100037;国土资源部深部探测与地球动力学重点实验室, 北京 100037;中山大学地球科学与地质工程学院, 广东 广州 510275,中国地质科学院地质研究所, 北京 100037;国土资源部深部探测与地球动力学重点实验室, 北京 100037,中国地质科学院地质研究所, 北京 100037;国土资源部深部探测与地球动力学重点实验室, 北京 100037,中国地质科学院地质研究所, 北京 100037;国土资源部深部探测与地球动力学重点实验室, 北京 100037,中国地质科学院地质研究所, 北京 100037;国土资源部深部探测与地球动力学重点实验室, 北京 100037 |
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| 基金项目： | 国家自然科学基金（41274096，41574091）和国家深部探测专项项目（SinoProbe-02）资助。 |
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| 摘 要： | 由多个地体拼接而成的青藏高原,有着世界上最厚的地壳。在高原中部,从拉萨地体到羌塘地体,穿过班公湖—怒江缝合带(BNS)的地壳厚度变化长期存在争议。本文主要论述从拉萨地体北端横跨BNS到达羌塘地体的深地震反射剖面探测的结果。探测发现了清晰的Moho反射,揭示了拉萨地体—羌塘地体Moho深度和地壳厚度的变化。探测结果表明,在BNS下方Moho深度由南至北出现了6.2 km的急剧减小,并且与BNS向北28 km处的羌塘地体南部比较,地壳厚度变浅了12.5 km。否定了前人对BNS下方Moho存在20 km显著变化的认识。
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| 关 键 词： | 青藏高原中部 班公怒江缝合带 莫霍面 地壳厚度 深地震反射 |
| 收稿时间： | 9/2/2016 12:00:00 AM |
| 修稿时间： | 9/8/2016 12:00:00 AM |
Crustal thickness variation from Northern Lhasa terrane to Southern Qiangtang terrane revealed by deep seismic reflection data |
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| LU Zhan-wu,GAO Rui,LI Hong-qiang,LIWen-hui,XIONG Xiao-song and XU Tai-ran.Crustal thickness variation from Northern Lhasa terrane to Southern Qiangtang terrane revealed by deep seismic reflection data[J].Chinese Geology,2016(5):1679-1687. |
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| Authors: | LU Zhan-wu GAO Rui LI Hong-qiang LIWen-hui XIONG Xiao-song and XU Tai-ran |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Earth Probe and Geodynamics, Ministry of Land Resources, Beijing 100037, China,Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Earth Probe and Geodynamics, Ministry of Land Resources, Beijing 100037, China;School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China,Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Earth Probe and Geodynamics, Ministry of Land Resources, Beijing 100037, China,Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Earth Probe and Geodynamics, Ministry of Land Resources, Beijing 100037, China,Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Earth Probe and Geodynamics, Ministry of Land Resources, Beijing 100037, China and Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Earth Probe and Geodynamics, Ministry of Land Resources, Beijing 100037, China |
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| Abstract: | The Tibetan Plateau, which is made up of a number of terranes, has the world''s most thick crust. There is a long-term dispute concerning crustal thickness across the Bangong-Nujiang suture (BNS) from the Lhasa terrane to the Qiangtang terrane. This paper mainly reports the result of the study of deep seismic reflection profile in this area. A clear reflection of Moho was detected, which reveals the change of crustal thickness from the Lhasa terrane to the Qiangtang terrane. Moho exhibits a sharp decrease of 6.2 km across the BNS and becomes 12.5 km shallower from the northernmost Lhasa terrane to the south Qiangtang terrane at 28 km north of the BNS. The viewpoint based on deep seismic reflection data denies previous understanding of a 20 km offset. |
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| Keywords: | central part of Tibet Bangong-Nujiang suture Moho crustal thickness deep seismic reflection profile |
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